Lipid raft

Absorption of Lipids. (n.d.). Retrieved October 14, 2015. This article is a basic article that explains the absorption and digestion of lipids in our body. The author, unknown, goes into extensive detail concerning the break down by use of bile acids to break down large molecules. No experimentations were made. No arguments or sides were taken in this article. This article just sums up the basis of lipid absorption and digestion such as into the blood. It also explains the functions of lipids in…

Cholesterol is a lipid with a unique structure consisting of four linked hydrocarbon rings forming the bulky steroid structure. There is a hydrocarbon tail linked to one end of the steroid and a hydroxyl group linked to the other end. The hydroxyl group is able to form hydrogen bonds with nearby carbonyl oxygen of phospholipid and sphingolipid headgroups.Cholesterol is referred as an amphipathic molecule, that it contains its hydrophilic and hydrophobic parts. Cholesterol is usually synthesized…

Background: The cell membrane surrounds all cells and controls what comes in and what goes out of the cell. It is selectively permeable (it permits certain things to enter and prevents other things from coming in). There is a phospholipid bilayer in which the hydrophobic tails point inward and the hydrophilic heads point outwards. Inside this plasma membrane there is usually an integral protein, cholesterols, a protein channel (for substances that can’t enter through the phospholipid bilayer), a…

Q-1. Describe the function of hemoglobin in blood and describe how pH can affect the function of hemoglobin and the amount of oxygen in blood. Be sure to relate the lab results you obtained to this discussion. Hemoglobin’s main function is to carry oxygen throughout the human body. As the oxygen molecule is dissolved in the blood it combines with hemoglobin forming oxyhemoglobin. Oxygen released from oxyhemoglobin increases as the blood pH levels decreases. Deoxyhemoglobin can also bind to the…

Membrane Self-Assembly Processes: Steps Toward the First Cellular Life by Pierre-Alain Monnard & David W. Deamer Summary: To summarize, early cells must have had a membrane to encapsulate its components and keep them within the cell. This membrane was made up of amphiphiles. This membrane was very permeable and as a result, passive diffusion occurred. Later on this membrane evolved to be a little impermeable as to keep the metabolic reactions and catalysts that drive these reactions within…

Antimicrobial peptides (AMPs) are a class of host defence peptides found in all living organisms. They exhibit significant activity against bacteria, virus, fungi and several other pathogens. AMPs share certain common features. (a) They are small molecules with varying amino acid composition and length. (b) They are cationic, due to the presence of positively charged basic amino acids and (c) amphipathic, since they contain alternate hydrophobic nonpolar and hydrophilic, polar residues. AMPs are…

Théodore Géricault Le Radeau de La Méduse (the raft of the medusa) French Romantic artist (1798-1863) oil painting Théodore Géricault (26 September 1791 - 26 January 1824) is an influential French painter and lithographer. The Raft of the Medusa is known for his most famous piece, which is an oil painting on canvas completed during 1818 to 1819, when he was in the age of 27. The painting depicts the scene of the aftermath when a shipwreck occured, this is referred to a real event happened on…

Part 1 DB 2 “The plasma membrane allows fluids or gases to pass or diffuse through to specific molecules. It allows nutrients and other vital elements to enter the cell and waste materials to leave the cell. Oxygen, water, and carbon dioxide pass freely across the membrane, but amino acids and sugars are carefully regulated (University, 2015).” When thinking of an analogy for plasma membrane, what comes to mind it the stomach and digestion of food and how it reacts to food, filter foods, and…

Evidence for and against the Davson- Danielli model of membrane structure The plasma membrane is thin and has double layers. The plasma membrane has two dark lines and a lighter central region. The two dark lines suggests the presence of the protein on either side. The lighter central region suggests the presence of phospholipids. The dark grainy appearance could be the ribosomes. Ribosomes appear as dark granules in the cytoplasm. Measured by rule: approximately 1 mm actual size 10 nm…

figure 4a it shows which protein it shown in a membrane raft fraction before and after FCεRI stimulation. The figure show that it was a control test with the membrane raft fraction, and a second one with FCεRI. The proteins that was tested for was CTx, α IKK2, α SNAP-23, α Syntaxin 4, α VAMP-2. The paper wanted to see if IKK2 was going to react to stimulation of FCεRI. In the control experiment it shows that CTx was on the fifth band of membrane raft fraction. When it came to α IKK2 the band…